Englishfor English speakers
booster
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noun
an additional dose that makes sure the first dose was effective
—
noun
the first stage of a multistage rocket
—
noun
an amplifier for restoring the strength of a transmitted signal
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noun
a thief who steals goods that are in a store
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noun
(= promoter)
someone who is an active supporter and advocate
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noun
(= supporter, friend)
a person who backs a politician or a team etc
all their supporters came out for the game
they are friends of the library
voltage
Noun
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Voltage is an amount of electromotive force; a number of volts.